Alien converts between the rpm, deb, Stampede slp, and Slackware tgz file formats. If you want to use a package from another distribution than the one you have installed on your system, you can use alien to convert it to your preferred package format and install it.

AutoRPM is a program that can do any combination of the following: mirror RPMs from an FTP site, keep installed RPMs consistent with an FTP site or local directory and keep installed RPMs in a cluster or network of systems consistent. It is highly flexible and contains a fully command-line driven interactive install mode (for installing RPMs from the queue or for installing RPMs from your system interactively). It also handles recursive dependencies, multiple versions of the same RPM, the same RPM with multiple architectures, and more. It does some of the same tasks as up2date and AutoUpdate.

AutoUpdate is a Perl script which performs a task
similar to Red Hat's up2date or autorpm. It can be
used to automatically download and upgrade RPMs
from different HTTP(S) or (S)FTP sites, while also
handling dependencies. Moreover, it can also be
used to keep a server with a customized (Red Hat)
distribution plus all clients up to date.

CheckInstall keeps track of all files installed by
a "make install" or equivalent, creates a
Slackware, RPM, or Debian package with those
files, and adds it to the installed packages
database, allowing for easy package removal or
distribution.

Depot is a software management tool providing a simple, yet flexible, mechanism for maintaining third party and locally developed software in large heterogeneous computing environments. Depot integrates separately maintained software packages, known as collections, into a common directory hierarchy consisting of a union of all the collections. This common directory is defined as the software environment. A set of configuration options manages interactions and intersections between collections in the environment. Depot facilitates the introduction, update, and removal of collections in a software environment. Custom environments and complete test environments can be easily created for individual machines or for sets of machines. Collections with unexpected problems can be replaced with previous versions or simply removed. Individual collections or files can be moved from remote filesystems to the local disks of workstations without the worry that the files may become stale. All this is achieved with minimal wasted disk space and administrative overhead.

The "dpkg" suite contains the programs which
handle Debian (.deb) packages. It was developed on
Debian GNU/Linux but can be used on all Linux
distributions and most Unix systems. The "dpkg"
command can be used to install, remove and manage
.deb binary packages, and it maintains a package
database which gets updated on changes. It is also
a front-end to the low-level "dpkg-deb" tool,
which is oriented towards manipulating archives.
However, the primary interface to dpkg is the
"dselect" program, which is used to get and
display packages for the user to select for
(de)installation.

dpkg-sn is a textual navigator for Debian/GNU Linux systems. It provides recursive exploration on main fields of each Debian package (.deb) installed on the system. It is also possible to search and view files owned by a package. The selection of a package-group or a file-group is made with regular expressions.

epkg is a package manager which uses the Encap Package Management System, a method for flexibly handling installation and management of third-party software on a Unix system. Encap places each package in its own subdirectory, then automatically manages symlinks to their appropriate places in /usr/local. The Encap package format includes features like postinstall scripts and prerequisite checking. Other features include builtin tar/gzip extraction, optional builtin FTP and HTTP support, transaction logging, and the ability to automatically upgrade a package to the latest version.

The Fink project wants to bring the full world of Unix Open Source software to Darwin and Mac OS X. It modifies Unix software so that it compiles and runs on Mac OS X and makes it available for download as a coherent distribution. Fink uses Debian tools like dpkg and apt-get to provide powerful binary package management. You can choose whether you want to download precompiled binary packages or build everything from source.

Glitter is a text-mode interface to the RPM package management tool. It allows you to browse packages installed on your system, and verify, query and uninstall those packages. It also allows you to update packages with new versions and install new packages.